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In 9af6f1bd, the -d option
was dropped from insertkeys.py. This was done to allow an
Android distribution to replace the default version of
keys.conf distributed in external/sepolicy/keys.conf. keys.conf
was modified to reference the publicly known test keys in
build/target/product/security.

Unfortunately, this broke Google's build of Android. Instead
of incorporating our keys directory, we were using the
default AOSP keys. As a result, apps were getting assigned
to the wrong SELinux domain. (see "Steps to reproduce" below)

This change continues to allow others to replace keys.conf,
but makes DEFAULT_SYSTEM_DEV_CERTIFICATE available as an
environment variable in case the customized version wants to
make reference to it. This change also modifies the stock
version of keys.conf to use DEFAULT_SYSTEM_DEV_CERTIFICATE,
which should be appropriate for most Android distributions.
It doesn't make any sense to force each O...